Stainless steel catalyst for air pollution control: structure, properties, and activity

Abstract

With the awakening of environmental awareness, the importance of air quality to human health and the proper functioning of social mechanisms is becoming increasingly prominent. The low cost and high efficiency of catalytic technique makes it a natural choice for achieving deep air purification. Stainless steel alloys have demonstrated their full potential for application in a variety of catalytic fields. The diversity of 3D networks or fibrous structures increases the turbulence within the heterogeneous catalysis, balance the temperature distribution in the reaction bed and, in combination with a highly thermally conductive skeleton, avoid agglomeration and deactivation of the active components; corrosion resistance and thermal stability are adapted to highly endothermic/exothermic or corrosive reaction environments; oxide layers formed by bulk transition metals activated by thermal treatment or etching can significantly alter the physico-chemical properties between the substrate and active species, further improving the stability of stainless steel catalysts; suitable electronic conductivity can be applied to the electrothermal catalysis, which is expected to provide guidance for the reduction of intermittent emission exhausts and the storage of renewable energy. The current applications of stainless steel as catalyst or support in the air purification have covered soot particle capture and combustion, catalytic oxidation of VOCs, SCR, and air sterilization. This paper summarizes several preparation methods and presents the relationships between the preparation process and the activity, and reviews its application and the current status of research in atmospheric environmental management, proposing the advantages and challenges of the stainless steel-based catalysts.

An ICP-MS study on metal content in biodiesel and bioglycerol produced from heated and unheated canola oils

“…Additionally, it can differentiate between different isotopes of the same element, making it valuable for isotopic labeling applications (Helaluddin et al 2016 ; Korn et al 2007 ; Todolí 2019 ; Woods and Fryer 2007 ). This technique is widely used for detecting metallic pollutants in complex environmental samples (Cregut et al 2022 ) and the presence of trace metals on synthesized materials (Li et al 2022 ; Wang et al 2022 ). Although some studies have explored the elemental composition of biodiesel (Amais et al 2012 ; de Souza et al 2011 ; Elkadi et al 2014 ; Ghisi et al 2011 ; Lepri et al 2011 ; Pereira et al 2014 ; Pillay et al 2012 ; Sánchez et al 2015 , 2014 ; Woods and Fryer 2007 ), very few studies have looked at the elemental composition of biodiesels and their oil feedstock together (Chaves et al 2011 ; Lepri et al 2011 ), and no study has reported the effect of thermal stress on the distribution of metallic and non-metallic elements from oil to biodiesel and biogylcerol phases produced from it.…”

Monolithic CuMnO2-Nanosheet-Based Catalysts In Situ Grown on Stainless Steel Mesh for Selective Catalytic Reduction of NO with CO

“…Thus, it is indispensable to develop the in situ growth technology of Cu–Mn–O catalysts on a low-cost substrate with good mechanical strength, high thermal conductivity, and excellent oxidation resistance. Nevertheless, there are few works focusing on this aspect. − …”

The Technology of Tail Gases Purifying in Nitric Acid Plants and Design of deN2O and deNOx Reactors—Review

“…Fluidized bed reactors provide the best gas-solid body contact; therefore, their dimensions can be smaller than those of packed or monolythic bed reactors. However, this requires using catalysts with high mechanical strength, because during fluidization, abrasion of the catalyst bed may occur [37,59,60].…”